What Does P0907 Mean?
The TCM has detected that the gate select position sensor circuit voltage exceeds the maximum expected threshold. This high voltage reading typically points to a short to battery voltage on the signal wire, an open sensor ground circuit, or an internal sensor failure. The TCM uses this sensor to determine the left/right gate position in automated manual transmissions.
Safety Warning
Incorrect gate position sensing can cause the TCM to engage the wrong gear or prevent shifting entirely. Do not drive; have the vehicle towed for repair.
Common Causes
35%
Open ground wire in the gate select sensor circuit
30%
Short to battery voltage in the signal wire
20%
Gate select position sensor internal failure producing high output
15%
TCM input pull-up resistor fault reading high
Diagnostic Steps
1
Step 1: Measure gate select sensor signal voltage at the TCM connector — if above 4.8V, confirm the high condition; this points to an open ground or short to power.
2
Step 2: Verify the sensor ground circuit — measure resistance from the sensor ground pin back to the TCM ground pin; should be less than 5 ohms.
3
Step 3: Disconnect the sensor and check if voltage on the signal wire at the TCM drops — if it does, the sensor is internally shorted high; if it stays high, there is a harness short to power.
4
Step 4: Inspect the harness for chafing where it could contact power wires, particularly near the starter motor, alternator, or fuse box.
5
Step 5: Replace the sensor if internal failure is confirmed; recheck after clearing codes and performing the TCM adaptation/learning procedure.
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
The TCM has detected that the gate select position sensor circuit voltage exceeds the maximum expected threshold. This high voltage reading typically points to a short to battery voltage on the signal wire, an open sensor ground circuit, or an internal sensor failure. The TCM uses this sensor to det...
The most common cause of P0907 (Gate Select Position Circuit High) is: Open ground wire in the gate select sensor circuit
Typical repair costs for P0907 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Incorrect gate position sensing can cause the TCM to engage the wrong gear or prevent shifting entirely. Do not drive; have the vehicle towed for repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0907 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
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